Doesnt matter on which one you would be touching up, it would really be profitable as long there's a demand into it.
On both sides, for the gamblers and for the operators. The profit is there mostly on the operators. And for the sportsbettors or gamblers for online casino games, the profit relies on their luck and analysis.
This varies because no one can guarantee that's going to be profitable on them as we have to deal with unlucky moments. While for the operators/house, the edge is always on them.
Some gamblers could be lucky and good at gambling but the majority of the gamblers are actually losing money, which makes the operators profitable. Sports betting and casino, are a type of gambling that the operators have the edge over us, otherwise, this industry will not survive, especially for sports betting which is a big industry as there are lots of sports bettors all over the world.